Sam Altman's Worldcoin project has launched a self-custodial mobile app called the World App, which allows users to manage their World ID and a range of cryptocurrencies. The app is built on the Ethereum sidechain Polygon and has been engineered to have "gas-free transactions," meaning that it covers the gas fees for transactions. The app's development relies on a range of crypto firms, projects, and tools, including Uniswap, ENS usernames, and Ramp and Moonpay for on and off-ramps. The World App has already accrued 1.6 million users and logs 60,000 transactions on a typical day, and it is the first product from the elusive identity upstart that is accessible to everyone.